15.—(1) Work No. 7A and 7B shall not commence until a written scheme for compensatory flood storage has been submitted to and has, after consultation with the Environment Agency, been approved by the Enfield London Borough Council.
(2) The compensatory flood storage shall be constructed in accordance with the approved scheme.
(3) The written scheme of flood compensation shall include—
(a)a schedule of staging and timing relating to the construction of Work No. 7A, 7B and the compensatory flood storage;
(b)flood storage up to and including the modelled 1 to 100 chance in any year including a 20% allowance for climate change flood level; and
(c)no increase in flood risk off site.